Which OSI layer is responsible for error detection and correction at the data link layer? MCQ with Answer and Explanation

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Which OSI layer is responsible for error detection and correction at the data link layer?

A. Data link layer

B. Transport layer

C. Physical layer

D. Network layer

Answer: Option A

Solution (By JKSSB Mock Tests)

The data link layer performs error detection (and sometimes correction) using frame check sequences.

This question belongs to: Computer Computer Networking

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Question #1

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Which type of network spans across multiple office locations in different cities or states, typically requiring leased telecommunication lines?

A. MAN

B. PAN

C. WAN

D. LAN

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Correct Answer: Option C

Explanation:
A Wide Area Network (WAN) connects separate business branches across regional, national, or global boundaries.

This question belongs to: Computer Computer Networking

Question #2

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Which type of network topology requires a central controller or hub to connect all peripheral nodes, making the entire network dependent on that single central device?

A. Star Topology

B. Mesh Topology

C. Bus Topology

D. Ring Topology

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Correct Answer: Option A

Explanation:
In a star topology, each network host is connected to a central hub or switch. If the central device fails, the whole network goes down.

This question belongs to: Computer Computer Networking